Exmark Lazer Z - Manual (Page 52)

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c) When the engine is running and the buzzer emits intermittent beeps, the
buzzer is warning the user that the engine oil pressure is low, OR the
alternator is not charging. Perform the following steps.
1. Turn the unit off, wait for all moving parts to stop, and remove key.
Allow the engine and engine components to cool.
2. Check the oil level and fill, if necessary, as described in Section 5.1.1.
3. Check for oil leaking from engine. If the engine is leaking, see
Engine Service Dealer.
4. Check to see if the water pump/alternator belt is intact. If belt is
present, there could be a charging problem, see Engine Service
Dealer. If belt is missing, do not run unit, as unit can overheat and
damage the engine. See Engine Service Dealer .